Sale 1:

https://backpack.tf/profiles/76561198004375426#!/compare/1585267200/1585440000

https://backpack.tf/profiles/76561198325595749#!/compare/1585353600/1585440000

Bulk

sale 2:

https://backpack.tf/profiles/76561198325595749#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198080179568#!/compare/1585440000/1585526400

QS

sale 3:

https://backpack.tf/profiles/76561198080179568#!/compare/1587772800/1587859200

https://backpack.tf/profiles/76561198004952793#!/compare/1587772800/1587859200

Sold for 17 keys

sale 4:

https://backpack.tf/profiles/76561198004952793#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198063247274#!/compare/1588377600/1588723200

Sold for DBD Slick + 6 keys

Slick Mini:

https://backpack.tf/suggestion/5ec1ac1ce8963a65db63e13a

Suggestion for 21 keys

Total is 28 keys

https://bot.tf/stats/listings/MLV1GR5O

B/O of 26 keys, capping

sale 5:

https://backpack.tf/profiles/76561198337734785#!/compare/1586649600/1586736000

https://backpack.tf/profiles/76561198016706143#!/compare/1586649600/1586736000

Sold for Keys, at least 15

sale 6:

https://backpack.tf/profiles/76561198016706143#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198316071886#!/compare/1587772800/1587859200

Sold for 16 keys

sale 7:

https://backpack.tf/profiles/76561198095125857#!/compare/1586390400/1586736000

https://backpack.tf/profiles/76561198054198170#!/compare/1586649600/1586736000

Bulk

sale 8:

https://backpack.tf/profiles/76561198054198170#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198172248317#!/compare/1587600000/1587772800

Sold for 23 keys

sale 9:

https://backpack.tf/profiles/76561198172248317#!/compare/1589068800/1589241600

https://backpack.tf/profiles/76561198302802994#!/compare/1589068800/1589241600

Sold for 18 keys

Sale 10, 11:

https://marketplace.tf/items/tf2/30885;5;u15

$35 / $1.75 = 20.00 keys

$28.6 / $1.77 = 16.16 keys

Total sales @:

16, 16, 17, 18, 20, 23, 26 keys

buyers up to ~16 keys,

sellers at 26,

note that 26 capped from higher,

calling 16 low,

26 high,

taking 17 - 23 keys.